Grinding machine



. H. S. BERGEN GRINDING MACHINE Sheets-Sheet 1 Fil ed May 5, 1920 I Imfem I 017 7 15,551 92 Sept. 4, 1923.-

H. 5,. BERGEN GRINDING MACHINE I Filed s, '1920 v 3 Sheets-Sheet 2 D Sept. 4,

H, BERGEN GRINDING MACHINE 3 Sheets-Sheet 5 Filed May 5, 1920 Patented Sept. 4, 1923.

UNITED... strains E T Q H i'iT 1 HARRY srnnemv; or T LE O, oEIo, assrenon T0 GARDNER MACHINE o'omranik or SOUTH BELOIT, ILLmeIs, A comesrron or rnnmors;

GRINDING M GHIN To all whom itmayconcern citizen of the United States, residing at Toledo, county of Lucas, State of Ohio, have invented certain-new and useful Improve ments in Grinding Machines, of which the following is a specification. p

My invention relates more parti'eul'arly to machines of the so-call'ed Gardner' type in which the grinding element is a rotary horizontal table-or disc covered with abrasive presented ordinarily by'hand or by some" form of holder or tool. invention is particularly concernedzwith the means for pre senting the work tothe table: Fortliis pu-rpose I employa' rotary head carrying a plurality of work supports to'whi ch the articles to be ground aresecured by suitable holders or tools successively, the continuing revolution of the head carrying theholders with I V the specific disclosure is for the purpose of exemplification only and that the scope of the invention is" defined in the following claims in" which I have ende'avoredto distinn'nish it from the prior'art so far as knownuto mewithouthowever relinquishing r or ahandoninganyportion orfeature thereof. In the drawings Fig. l is a side-elevation,

partly in vertical section of agrindingmachine embodying: my invention; Fig; 2 is a plan thereof partly broken away; Fig: 3 an end elevation on a plane at right angles to that of Fig. 1 partlybroken away to show" which is journale'd ithe'verticalshaft'l on' tlle" upper. end of which the 'grinding table or disc 8 is supported Said shaftdsfprovidedi with a heveled pinion 9 'meshinQ'with a 'simi} lar'pini'on 10 upon a countershaft 11' which Application sea Ma 5; 1920. Serial no. 3783992.

as for eXaanpl'ebyapulley" 12. V V The" rotary head 13 which carries the work supports His journaled' upon a shaft r 15 secured invertical position in a standard p is driven in any'usua'l or"approved mann'er' 7 Be it known that I, HARRY SpBnnenN, a r

or column 15*. Saidstandard' or column is V bolted or otherwise secured to an extension 17 of the base'of the grinding table standard.

The work supporting head 13 may be :driven in any suitable; manner and I have V V shown in the drawings a 'satisfactorychain" material to which the-articlc tobe ground 1's of gearing for driving; it from the rotaryshaft of the grinding tableg'. For this put- 7 v pose'a countrsha-ftlS is mounted in a nous;

ing I9 secured'in an openin'gin'the column ofthe grinding table supportsand said shaft is provided at its inner end witha beveled pin-ion 20 meshing with the bevelgear 9 on' the-'shaft of the grinding. ta'lole. The other end ,of the countershaft is provided with a spur gear-'21 which'engag'es aispur gear 22' upon a short shaft 23 which is 'suitablyvjou'r nal'ed in a housing 24 which emlor'aces also sa-ifd: spur gear 2 1. Shaft 23is' connected a clutch 25 with ya wormshaft2 6journaletl in column '15, and t'heworm- 2? of said worm shaft engagesa worm wheel Q SQuponthe lower end of a vertical shaft 29 (see Fig. upon the upper end of which is spur gear, 30. The last-mentioned 'gear. engages and cured to a reduced neck '32 on the lo'werend idrives a spur gear 31 keyed o'r' other'wisese-i of the casting head 13. It will thusbe seen 1 that the casting head or work supporting head is driven from the'sh'aft' of the grinding table but at a very lowjspee'd. Preferably the spurs 30, 31' are enclosed in ai hous ing- 33 (see Figs l'and 4').' s Thebore 34 ofth'e'rotary head His preferably hushedat 35 and 36"wher'e it bears upon thestationary shaft 15 and the latter, is provided with-a'rcollar 3 7 suitably pinned thereto above the rotary head; I I i i In the particular; embodiment ofmy-in vention' shown the" head 13 is provided with four .work supports 1'4: which are suitalily grooved: on theirrespective faces as at;38't o" receive the attaching tools'orjldevices' for so curing the work thereto; Thef work supports are pivoted rtOfth ends of 1oarallel-rnotion links 39, 40 which,,atftheirinne'rjendsare 1 pivoted r between pairs of 'iearsi 4G1 formedmg' bores said 7 upon the rotary 'castin'gihead' 13, p"i ns ex tending through re -st V V ears and the inner endsof' the'linksfofthi's purpose. The downward .movement of the links carrying the work supportsjislimited by arms 43 formed upon the respective up per links 39, and the lower ends of said arms are perforated to receive adjusting screws 44. The screws 44 are provided withheads or turn wheels 45 for adjusting them and are adapted to bear against the heads of screw bolts 46 tapped into bosses 47 upon the body of the rotary head. Springs 48 are interposed between-seats 49 on said bosses and the heads ofadjustable screwbolts 50 in the lower endsof said arms, the purpose of this construction being to cushion the drop after having the work securedthere toit is necessary that they be raised to a height suificientto clear this rim and then be low ered until .the work comes in contact with the grinding table. For this purpose 1 provide a cam 54 which is adjustably bolted by its shank 55 to thecasing 53, the shank being provided with slots 56,. 57 through which bolts 58, 59 extend into the casing. i Each or the work Supports car see an antl-frlctlon wheel 61 which is so mounted on said sup 'port as to engage the cam 54 as the work sup; port to whichit is connected approaches the rim 52. Roll 61 rides over the cam which is extended a sufficient distance over the rim to maintain the worlrsupport in an elevated position until the latter has cleared the rim. The roll then ridcsoff the inclined end of the cam'and the support with the attached work drops untillthe latter is in contact with the grinding, table, the spring 48 servingto cushion the drop and ease the work into con- 7 tact with the table. I V

The operation ot my improved grinding machine'is obvious. The grinding table is driven at a isuitable ratev of speed and the work supporting head is drivenslowly from the grinding table by the chain of reducing gear heretofore described. The revolution of the worksupportinghead is sufficiently slow topermit the work readily to be secured to the work supports and this is performed by the machine operative as the supports successively arrive in suitable or convenient positions. The continued rotation of the head brings the supports successively adj acent the table whenthe cams, operating on thelrollers','raise the supports, maintain them until they have cleared the rim andthen per mit them to descend until the work is in contact with the grinding table. When each pieceof work. has been'suliiciently ground it is removed from the work support and tromrthe grinding table:

I said rim,

. permit them to I claim: V

v1. In a grinding machine, the combination with a grinding table, or" a rotary head, a series of work supports on said head, means for rotating said'head to carry the supports toward-and away from said grinding table, said supports when away trom' said grinding table being entirely supported by said head, means for taking up the weight or said supports when they reach and when they leave said table, said-supports. when over, said tablebeing treeto be drawn by gravlty toward the table whereby work thereon will means for effecting such perpendicular movement when the carrieriis adjacent to 3. In a grinding machine and in combinationv with the grinding table thereoia. ro tary head, a seriesofwork supports carried by said head, connections between saidhead and. work supports l providing a vertical movement for the latter and me ns i1 1 mi ing the work supports adj acentthe edge of the tableand permittingthem to drop into operative relation to the table atter passing the edge thereof. I

4. In a grinding machine and in combine- 5 'tion with the grinding table thereofia r0:- tary head mounted torrotation about a vorv tical axis adjacent the, table, a series of work supports mounted on the head and car ried thereby from a position remote from the table to a position over the table, connections :fromthe work-support to the head permitting ayertical movementof the supportsand a camadjacent theedge of the table and in thepath of the supports to guide.

the latter over the edge of the table and permit them to'fall into operative relation to the table after passing the edge thereof;

5. In a grinding machine and in combina tion with-the grinding table thereof, a rotary head, a series, of work supports carried thereby, pivoted links conne,cting the work supports and the head and affording vertical movement for the supports and a cam adja-. cent the edge of the table andengagmg' the supports as they are carried over the edge of the table to maintain them during such iii movement above the edge otthe table and drop into operative relation tothe table. 1. of f V 6. In a grinding machine, the combination. with a grinding table, arotary. head mounted ,on a vertical axis ad cent the table a series ot worksupports mounted onthehead, links 7 work supports to permit sem n, movement pivoted to the head; and to t-herespective...

of the latter, and cams in the'path of the supports for guiding them to and from grinding position over said table.

7. In a grinding machine and in combination with the grinding table, a head journaled upon a'vertical axis adjacent the table, pairs of linkspivoted on horizontal axes to the head, work supports pivoted to the respective pairs of links, and a cam arranged in the path of the work supports for guiding lation to the table.

9. .In a grinding machine-and in combination with the grinding table thereof,a rotary head mounted on a vertical axis adjacent the grinding table, a series of work supports,

pairs of parallel motion links connecting the respective work-supports to thehead, an arm on one of thelinks of each pair, ad-

justable means on the arm for limiting the downward movement of the work support and a cam arranged in the path of the work supports for'raising thelatter over the edge of the grinding table and permitting them to fall into operative relation to the table.

'10. In a grinding machine and in combination with the grinding table thereof, a

.rotary head -mounted. on a vertical axis adjacent the table, pairs of parallel motion links connected to the head, a work support carried bylthe' parallel motion links, an arm connected to one of each pair of parallel motion links, a set screw in the arm adapted to engage an abutment on the head to limit the downward movement of the work support, and a cam in the path of the work supports adjacent the edge of the grinding table and adapted to, guide the supports over the edge of the 7 table.

11.. In a grinding. machine and in combination with the grinding table thereof, a rotary head mounted on a vertical axis adjacen't'the, table, pairs of parallel motion links connected to the head, a work support carrier by the parallel motion links, an arm con nected to one of each pairof parallel mo? tion links, a spring adapted to engage the arin, and a cam in the path of the'worksupports adjacent the edge of the grinding table and adapted to guide the supports over the edge of the table.

12. In a grinding machine and in oombi nation with the grindingtable,;a rotary head journaled on a vertical axis adjacentlthe table, pairs of parallel'motion links piv i oted to the head, work supports carried by the respective pairs of the parallel motion links, an arm connected to a link of each pair, a stop for limiting the inward movement of the arm, a spring for engaging and cushioning the inward movement of the arm, and a cam arranged in the'path' of rotation of the supports-and adapted t'o guide them over the'edge of .thetable;

1.3. In a grinding machine and in" combination with the grinding table thereof, a rotary head mounted on a vertical axis adjacent the table, reducing gearing'interme diate said table and head for rotating'the latter at a relatively slow speed, work supports carried by the head, connections be: tween said'worksupports and head permitting a vertical movement of the respective supports, and a camarranged in the path of movement of the supports and adapted to raise the same adj acent the edge of the table and permit them to fall into operative relation to the surface of the table. v

14. In a grinding machine, the combination with a grinding table, of'a rotary head mounted upon a vertical axis adjacent the table, a series. of work supports, parallel motion link-s connecting said work supports to r the head for vertical movement, and means for guiding said supports to and from said table; Y m v 15. In a grinding machine, the combination with a; grinding table, of asupporting frame, a series of work holders connected with said frame and freeto move vertically, means for moving said frame to carr'ysaid holders toward and away from position over said table, said work holders when away from said table being down so that work secured thereto is below thegrinding face'of the grinding table, and means oper ating automatically during travel of said holders toward said table to raise said holders to permit work thereon to be brought 7 over the'table said holders when over the table being released sothey may present the work to thetable for grinding. 16. In a grindingmachine, the combination with a grinding table, offa supporting frame, a series of work holders connected with said frame and free tomove vertically, means for moving said frame'to carry said over said table, said work holders when away from said table being down so that- 12c holders toward and -awayf rom a position work secured thereto is'below the grinding" face of the grinding table; means operating automatically during travel of said holders toward said table to raise said holders to a permit work-thereon to be brought over.

the table, said holders when over the table being released so they may present the work abutments on said frame for path of said holders for-raising them iust.

before they are brought over the table and to release them when over the table vhercby work secured on the holders may be presented to the table for grinding.

18. In a grinding machine, the combination with a grinding table, of a plurality of wort holders, means formoving said work holders successively over and across iolders forraisingthem just before they ch'and leave the table, said holders being 11 e from said raising n us when over the s'able whereby work secured thereto may be :esented to the table for grinding.

19. In a grinding machine, the combina tion with a grinding table, a supporting; adjacent said table, a plurality of work holders connected with said frame to travel therewith and to movevertically, said work holders, mean for'moving. said frame to cause said work holders to be carried over and across the grinding table, said -work holders when away from said table being supported by said abutments whereby work on the holders will be below the grinding face of the table a distance determined by the amount of grinding desired and means for cooperating with said holders just before they reach'the table to raise said hol ers to permit the work thereon to be brought into position over. the table, said holders when in position over the table being free to move downwardly to present the work tiereon to the table for grinding.

20. In a grinding machine, the combination with a grinding table, supporting frame adjacent said table, a plurality of work holders connected with said frame to travel therewith and to move vertically,

abutments on said fran'ie for said work holders, means for moving" said frame to cause said work holders to be carried over and across the grinding table, said work holders when, away from said table being supported by said abutments whereby work thereon to the table for grinding, and

tion of a grinding table, a frame, a plurality of work holders connected with said frame;

to travel therewith and being adapted to more vertically means for moving said frame to carry said holders successively across a section of the grinding table, said holders when away from said table being 7 in a lower I .iai'e its presented face below plane of the grinding table means for elevating the holders as they reach tile tablewhereby the work thereon be raised above the grinding plane, said holders being free when over the grinding table to drop, shock absorber springs for cushioning the drop of the holders and the application of the work to the table, and

means for positively limiting the downward movement of the Work holder and thereby the amount of grinding on work supported thereby. v j .7

22. in a grinding machine, the combina Lion of a grinding table, a frame adjacent said table, work holder hinged to:said frame to swing ertically, means for moving said frame to carry said work holder over and across the grinding table, adjustsole ebutments between said frame and holder, said abutments taking up the weight of the holders when the holder is away from the table whereby work supported on the holder will be projected below the grinding plane of the grinding table, and means for-"raising the holder before it comes into tion of a horizontally rotatable grinding table, a frame adjacent said table, a Work holder hinged to said table to swing verti call), abutments between said frame and bolder, means for moving said frameto carry said holder over and across the grinding table, said abutnients supporting said position whereby work secured holder when away from the table whereby I work secured thereto will be projected be low the grinding face of the grinding table, means for raising the holder before it comes over the table to raise the work thereon above the grinding face of the table, said holder being released from said raising means when over the table, and a shock absorber spring for cushioning the downward movement of said holder, the weight of said holder overcoming said springs to press the ',work against the table during grinding thereof, said,abutments'limiting the downward movement of said holder and thereby, the amount of grinding. In a grinding machine, the combination of a. horizontal grinding table, work holder mechanism, means for bodily-moving said holder mechanism toward and acrossthe table, and means in the path of the holder mechanism for lifting it'tofraise work thereon above the grinding plane of the table and releasing'the holder mechanism when over the table to permit it. to apply the work to the table for grinding. I 25. A grinding machine having in combi-. nation, a rotary grinding wheel, a carrier rotatably mounted on an axis which is parallel with. the axis of said wheel and is located beyond the edge of said wheel, means for driving said wheel and said carrier, a plurality of work holders mounted on said carrier to travel therewith in an endless path, and means for successively effect ing the movements of said work holders first toward the grinding wheel as the work holders arrive opposite the grinding face and then away from the grinding wheel as the work holders leave the grinding face.

26. A grinding machine having, in combination, a grinding wheel and a work carrier mounted on parallel axes, a plurality ofwork holders mounted on said carrier to I travel therewith in an endless path across the grinding face of said wheel, and means for successively effecting the approaching and receding movements of said work car: riers with respect to the face of said grind-g ing wheel as the work carriers arrive opposite and leave such grinding face respectively. Y r

27. A grinding machine having, in combination, a grinding element and driving means therefor, a plurality of work holders, means for movingsaid work holders successively across the grinding face of said element, and means for effecting an approaching movement of each work holder toward such grinding face as the work holdercomes opposite such face, and for effecting a receding movement of each work holder from said grinding face as the work holder is about to move off from the grinding element. T

28. In combination'with a grinder having a horizontal grinding table mounted to rotate on a vertical axis and also having a rim peripherally surrounding said grinding.

table, a rotary structure mounted on a vertical axis at one side of said table and carrying a plurality of work supports, each support being arranged to have a movement up and down with relation to the remainder of said structure, and means for consecutively causing such up and vdown motion of said supports when adjacent to said rim. I

29. In combination with a grinder having arotary'grinding wheel with a grindingsurface on one side thereof, a work carry- 7 one end to said-T central portion and at its opposite end to said worksupport.

30. A grinding inacliinehaving, in combination, a rotary grinding wheel'having its 7 a grinding facevon one side of the wheel,fa

rotary work supporting 'structuremounted on an axis parallel to the axis of said wheeland located beyond the periphery of the wheel, said structure. comprising a central portion, a plurality of work-supports dis- 1 posed peripherally about the structure, and

a plurality of' pairs of parallel links pro-" jecting radially from said central-portion,-

each pair of links supporting. one-of said work supports, the links ofeach pair being pivoted at one, end to said central portion v axis of the work carrier being located bev yond the periphery of saidwheel, apluralityof work holders mounted on said car-' 'rier. to travel therewith over the face of said wheel, said work holders being free to 'descend by gravityvwhen above said" wheel to' allow the work in said holders to rest .on'

means for successively raising said holders asthey move off one peripheral portion of said wheel and for permitting the descent of said holders as they approach another peripheral portion of said wheel.

32. A grinding machine having, in combination, a rotary grinding wheel and a work carrier mounted onparallel vertical axes, the axis of the work carrier belng located beyond the periphery of said wheel, a plurality of the grinding face of the wheel, and cam V work in said holder to rest on the grinding 7 face of the wheel,-cam means for successively,

wheel, and stop means adapted to be ad-Q if justed to different "fiXeCl positions for determining the lowermost position of said work holders.

33. A grinding machine having, in combination, a rotary grinding wheel and arwork carrier mounted on parallel vertical axes, the axis of the work carrier being located beyond the periphery of said wheel,-a plurality ofwork holders mounted on said carrier to travel therewith over the face of said wheel, said Work holders being free to descend by gravity when above said Wheelto allow the work in said holder-to rest on the grinding face of the wheel, means for successively raising said holders as they move off one peripheral portion of said Wheel and for permitting the descent of said holders as they approachanother peripheral portion of said Wheel, stop means adapted to be adjusted to different lined positions for determining the lowermost position of said Work holders, and yieldable stop means for each Work holder arranged'to come into, play heiore mentioned stop means acts.

3%. A work carrier for grinding machines comprising a central portion mounted to ro tate ion a Vertical axis, a plurality of pairs of parallel links projecting radially from said central portion, the links of each pair being positioned one above the other and being pivoted at their inner ends to said central portion, a plurality of Work sup-ports each of Which is pivotally connected to the outer ends of-one'ot said pairs of links, and

means for adjustably limiting the downward movement oi'sald links. I

35. A rotary Work carrier for grinding machines comprising a central head, a plumentioned stops for limiting the movement of its Work holder-in one direction.

' HARRY S. 

